Stettner Johanna, Frank Paul, Griesser Thomas, Trimmel Gregor, Schennach Robert, Gilli Eduard, Winkler Adolf
Institute of Solid State Physics, Graz University of Technology, Petersgasse 16, A- 8010 Graz, Austria.
Langmuir. 2009 Feb 3;25(3):1427-33. doi: 10.1021/la802534q.
In this article we present a comprehensive study of 11-mercaptoundecanoic acid self-assembled monolayer (SAM) formation on gold surfaces. The SAMs were prepared in ethanolic solution, utilizing two different substrates: Au(111)/mica and polycrystalline gold foils. Several experimental methods (X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and atomic force microscopy) reveal a well-defined SAM. The main focus of this work, however, was to test the stability of these SAMs by thermal desorption spectroscopy. The spectra show different desorption peaks indicating different adsorption states and/or decomposition products on the surface. The assumed monolayer peak, which can be attributed to desorption of the intact molecule, is detected at 550 K. Further desorption peaks can be found, which result, e.g., from cracking of the S-C bond on the surface, depending on the substrate quality and on the residence time under ambient conditions.
在本文中，我们对11-巯基十一烷酸在金表面自组装单分子层（SAM）的形成进行了全面研究。这些自组装单分子层是在乙醇溶液中使用两种不同的基底制备的：Au(111)/云母和多晶金箔。几种实验方法（X射线光电子能谱、傅里叶变换红外光谱和原子力显微镜）揭示了一个明确的自组装单分子层。然而，这项工作的主要重点是通过热脱附光谱测试这些自组装单分子层的稳定性。光谱显示出不同的脱附峰，表明表面存在不同的吸附状态和/或分解产物。假定的单层峰可归因于完整分子的脱附，在550 K时被检测到。根据基底质量和环境条件下的停留时间，还可以发现其他脱附峰，例如由表面S-C键断裂产生的脱附峰。
